Senior cats are the most at risk when it comes to age-related medical issues such as arthritis or often called osteoarthritis. The majority of cats (over 90 percent or so) that are 12 years of age and beyond can show signs of arthritis. Most of the signs of arthritis can easily be seen during the early stages of the disease, and that's because a lot of cats are great at concealing any kind of signs of discomfort or pain that they feel. This is the reason why most arthritis cases in cats are left untreated and undiagnosed for a long time (or never) by their pet owners. All the years of wear and tear of a senior cat's joints and bones (and its tissues) give rise to arthritis. Having said that, there are many other factors that can put a senior cat at a higher risk of getting arthritis, such as injury, genetics, infection, cancer, and immune disease.
Set an appointment with your best animal hospital Gresham, OR if you notice any possible signs of arthritis exhibited by your cat.